Today I Learned - Rocky Kev

TIL not to use === to check for NaN

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TAGS: javascript wat

Avoid using it for troubleshooting.

For example:

function resizeImage(size) {
  if (size === NaN) {
    console.log('Something is wrong.');
  }
}

Doesn't work. The check is always false!

Instead, check it with these:
Number.isNaN(size)
Object.is(size, NaN)
size !== size

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